EP1194121B1 - Steroid solution aerosol products with enhanced chemical stability - Google Patents

Steroid solution aerosol products with enhanced chemical stability Download PDF

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Publication number
EP1194121B1
EP1194121B1 EP00941435A EP00941435A EP1194121B1 EP 1194121 B1 EP1194121 B1 EP 1194121B1 EP 00941435 A EP00941435 A EP 00941435A EP 00941435 A EP00941435 A EP 00941435A EP 1194121 B1 EP1194121 B1 EP 1194121B1
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Prior art keywords
ketosteroid
container
coating
group
budesonide
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German (de)
English (en)
French (fr)
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EP1194121A1 (en
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Zheng Z. Wu
Nayna Govind
Peter R. Johnson
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3M Innovative Properties Co
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3M Innovative Properties Co
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/007—Pulmonary tract; Aromatherapy
    • A61K9/0073—Sprays or powders for inhalation; Aerolised or nebulised preparations generated by other means than thermal energy
    • A61K9/008—Sprays or powders for inhalation; Aerolised or nebulised preparations generated by other means than thermal energy comprising drug dissolved or suspended in liquid propellant for inhalation via a pressurized metered dose inhaler [MDI]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/57—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/57—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone
    • A61K31/573—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone substituted in position 21, e.g. cortisone, dexamethasone, prednisone or aldosterone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/58—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids containing heterocyclic rings, e.g. danazol, stanozolol, pancuronium or digitogenin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/12—Aerosols; Foams
    • A61K9/124—Aerosols; Foams characterised by the propellant
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/02—Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/06—Antiasthmatics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
    • B65D83/38—Details of the container body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
    • B65D83/44—Valves specially adapted for the discharge of contents; Regulating devices
    • B65D83/52—Metering valves; Metering devices

Definitions

  • the present invention relates to medicinal aerosol products and, in particular, to aerosol products such as metered dose inhalers for delivery of steroids.
  • the invention is particularly related to certain 20-ketosteroids that have been found to be highly susceptible to chemical degradation when formulated as solution aerosol products, and provides a way of enhancing chemical stability of such steroids.
  • Structure I shown below is a typical core structure for a large number of natural and synthetic 20-ketosteroids, with the standard IUPAC numbering system of the carbon positions 1 to 21 indicated.
  • These types of steroids have many well-known therapeutic uses, especially based upon their anti-inflammatory activity. It is often desirable to deliver such steroids topically using aerosol spray devices, such as metered dose inhalers (MDIs).
  • MDIs are commonly used to deliver steroids, e.g., beclomethasone dipropionate, to the airways of patients via oral or nasal inhalation for the treatment of asthma and allergic rhinitis.
  • HFC non-CFC hydrofluorocarbon
  • solution formulations are disclosed in U.S. 5,766,573 which are surprisingly chemically stable in propellant HFC 134a and/or 227 and ethanol in a conventional aluminum canister.
  • ciclesonide formulations are surprisingly chemically stable in certain solution MDI formulations disclosed in WO 98/52542.
  • Solution formulations of flunisolide are disclosed in U.S.
  • WO 98/13031 discloses recent work on reformulating budesonide as a non-CFC suspension formulation.
  • suspension formulations of a medicament are more likely to encounter problems with physical instability (e.g., agglomeration , crystal growth and deposition on the container wall, all resulting in inconsistent dosage delivery).
  • a drug delivery device providing medicinal steroid solution formulations with enhanced chemical stability would offer some significant advantages over suspension formulations. Besides homogeneity, solution formulations have been found in some cases ⁇ e.g., using HFC propellants and low ethanol content--to give dramatically higher respirable fractions (i.e., the percentage of active ingredient able to reach the airways of the lung) compared to a particulate suspension of the steroid drug. See U.S. 5,776,432. Furthermore, an aerosol product providing a chemically and physically stable aerosol steroid formulation using non-CFC propellant would offer the advantage of being more ozone friendly than currently available aerosol products with CFCs.
  • Patent publications WO9947195 and WO0030608 form part of the state of the art pursuant to Art. 54(3) EPC relevant to the assessment of novelty as far as they are entitled to the priority dates claimed.
  • WO9947195 does not mention that a medicinal aerosol steroid formulation can be chemically stabilized by use of an inert coating onto the surface of a pressurized canister.
  • MI98A002559 the first priority document of WO0030608, describes aerosol formulations of budesonide or combination of budesonide with ipratropium bromide, salbutamol or formoterol, comprising a hydrofluoroalkane propellant containing no chlorine and an alcohol as co-solvent.
  • the formulation is stored in a pressurized metered dose inhaler made of aluminium or tin plate with interior surfaces of stainless steel, anodised aluminium or inert organic coating in order to improve chemical stability of the active agent.
  • Patent publication US5776433 is directed to a flunisolide formulation which may be delivered by metered dose inhaler with a canister that is inert to flunisolide.
  • 20-ketosteroid having an OH group at the C-17 or C-21 position, or both, and being other than flunisolide may be chemically stabilized during storage in a metered dose inhaler formulation by use of an inert coating onto the inert surface of a pressurized canister.
  • C-17/21 OH 20-ketosteroids those steroids in particular having a C-20 ketone and an OH group at the C-17 position or, especially, the C-21 position or both (hereafter collectively referred to as "C-17/21 OH 20-ketosteroids") are subject to enhanced chemical degradation when stored in contact with a metal container (particularly the metal oxide e.g., Al 2 O 3 layer that forms on the interior surface of the container).
  • a metal container particularly the metal oxide e.g., Al 2 O 3 layer that forms on the interior surface of the container.
  • the vast majority of MDI's on the market, including all MDI steroid products use aerosol containers made of metal, usually aluminum. By utilizing an aerosol container having a non-metal interior surface it is possible to produce solution aerosol formulations of C-17/21 OH 20-ketosteroids having enhanced chemical stability.
  • a process for making a chemically stable steroid solution aerosol product by filling into a container a medicinal aerosol formulation comprising a dissolved 20-ketosteroid other than flunisolide and having an OH group
  • the present invention is especially preferred with respect to C-21 OH 20-ketosteroids (with or without a C-17 OH group).
  • the C-21 OH group can substantially increase biological activity of a steroid, but such steroids are also much more susceptible to chemical degradation in the presence of metal.
  • Particularly preferred 20-ketosteroids are budesonide, triamcinolone acetonide, dexamethasone, and betamethasone 17-valerate, all of which have an OH group at the C-21 position.
  • These steroids are all currently on the market as CFC particulate suspension formulations in metered dose inhalers and, at least in the case of budesonide, work has been conducted to reformulate this important steroid as a non-CFC suspension product in HFA propellants. See PCT published application WO98/13031.
  • the most preferred type of container for use in the present invention is a conventional aluminum (or aluminum alloy) aerosol canister, but with an interior coating of an inert material, such as a spray-coated, baked epoxy-phenolic lacquer (available from Cebal Printal U.K. Ltd.).
  • an inert material such as a spray-coated, baked epoxy-phenolic lacquer (available from Cebal Printal U.K. Ltd.).
  • Other metals, such as stainless steel may likewise be used with an inert interior coating.
  • the internal surfaces of metal valve components in contact with the formulation are similarly coated with an inert material.
  • Another preferred coating for the inside of the container is perfluoroethylenepropylene (FEP).
  • a preferred coating for the metal valve components is a very thin layer of glass, or other material, deposited by gas vapor deposition. Such coating is preferably used on all of the metal valve components in contact with the formulation, including the inside and outside of the metering chamber, inside and outside of the bottle emptier (if any), and the inside and outside of the valve stem (if metal), and may also be used to coat the inside of the canister.
  • the preferred such coating technique is the SilcosteelTM process available from Restek Corporation, Bellefonte, PA.
  • the SilcosteelTM aspect of the invention is useful even outside the context of the chemical degradation problem, for both solution and suspension formulations.
  • Preferred formulations use a liquified propellant such as hydrogen-containing (non-CFC) propellants, more preferably hydrofluorocarbons, such as 134a and/or 227.
  • a liquified propellant such as hydrogen-containing (non-CFC) propellants, more preferably hydrofluorocarbons, such as 134a and/or 227.
  • Particularly preferred formulations include about 0.1 to 0.5% C-17/21 OH 20-ketosteroid about 75 to 99% 134a and/or 227, and about 1 to 25 % w/w ethanol, more preferably about 80 to 95% 134a and/or 227, and about 5 to 20% ethanol.
  • the most preferred medicinal aerosol products according to the invention are MDI's comprising about 0.1 to 0.5% budesonide or triamcinolone acetonide dissolved in about 80-95% 134a and/or 227 and about 5-20% ethanol, contained in a coated aluminum aerosol canister equipped with a metering valve.
  • the present invention provides a medicinal aerosol steroid solution formulation product with enhanced chemical stability.
  • Such product includes a container equipped with a dispensing valve and containing a medicinal aerosol formulation having a 20-ketosteroid drug dissolved therein.
  • the 20-ketosteroid is other than flunisolide and has an OH group at the C-17 or C-21 position or both, and the container is provided with a non-metal interior surface so as to reduce chemical degradation.
  • the invention further provides a process for making a chemically stable 20-ketosteroid solution aerosol product, by filling into a container an aerosol formulation comprising a dissolved 20-ketosteroid other than flunisolide, said 20-ketosteroid having an OH group at the C-17 position or C-21 position or both, and said container having an inert non-metal interior surface so as to avoid chemical degradation of the 20-ketosteroid due to interaction with the container.
  • a medicinal aerosol device 10 comprising a pressurizable metal aerosol container 16 equipped with a metering valve 18.
  • the metal container 16 is preferably made of aluminum (i.e. aluminum or aluminum alloy) and has an inert interior coating layer 14.
  • the metering valve 18 includes a metal metering chamber 20 with a coating layer 22.
  • a plastic valve stem 24 instead of metal.
  • Fig. 2 shows an alternative preferred embodiment that is essentially the same as Fig. 1, but utilizes a fixed bottle emptier 26, with coating layer 28. Also, a solution gasket 30 is used to further prevent contact of the formulation with metal components.
  • the medicinal aerosol formulation 12 preferably includes a non-CFC propellant, a cosolvent (if necessary), and a therapeutically effective amount of dissolved C-17/21 OH 20-ketosteroid.
  • a therapeutically effective amount will nomally be a concentration so as to provide in the range of about 100 to 1500 mg per day using one to eight puffs.
  • Preferred propellants include hydrogen containing propellants, such as HFCs 134a and/or 227.
  • Ethanol is a preferred cosolvent, although other cosolvents and solubilization aids (e.g., surfactants) may be used.
  • the amount of cosolvent used is preferably an amount sufficient to completely dissolve the 20-ketosteroid.
  • the formulation 12 may also include other excipients, such as stabilizers, antioxidants, flavoring agents, and the like.
  • R 1 is H or an alkyl group
  • R 2 is an alkyl group
  • X is not H.
  • R 1 and/or R 2 alkyl groups are methyl, ethyl, propyl, butyl, pentyl, and hexyl groups, including their branched and cyclic isomers.
  • R 1 may form a ring with R 2 , preferably a cyclopentyl or cyclohexyl ring.
  • Examples of known 20-ketosteroids according to structure V include budesonide, triamcinolone acetonide, desonide, and fluocinolone acetonide.
  • Q is OH, H, Cl, or PO(ONa) 2 ;
  • X is H, Cl, or F;
  • Y is H, F, or Me;
  • Z is H or Cl;
  • R 1 is H, OH or propionate provided that when Q is not OH, then R 1 must be OH; and
  • R 2 is H, OH, or Me.
  • Examples of known 20-ketosteroids according to structure VI include alclometasone, beclomethasone, beclomethasone 17-monopropionate, betamethasone, betamethasone 17-valerate, clocortolone, desoximetasone, dexamethasone, dexamethasone sodium phosphate, dexamethasone 21-isonicotinate, diflorasone, flumethasone, methylprednisolone, paramethasone, prednisolone, tramcinolone, clobetasol, and fluorometholone.
  • C-17/21 OH 20-ketosteroids for particular structural examples, four preferred C-17/21 OH 20-ketosteroids according to the present invention, budesonide, triamcinolone acetonide, betamethasone 17-valerate, and dexamethasone, have the following structures:
  • the C-17/21 OH 20-ketosteroid is dissolved in the aerosol formulation and preferably contained in an inertly coated metal container.
  • coated simply refer to a non-metal interior coating that does not promote degradation at the OH substituents on C-17/21 OH 20-ketosteroids.
  • Inert coating materials include any suitable polymer, lacquer, resin, or other coating treatment that creates a barrier to chemical interaction of the dissolved C-17/21 OH 20-ketosteroid and metal on the container (especially metal oxides).
  • suitable interior coatings include epoxy-phenolic resins, epoxy-urea-formaldehyde resins, polytetrafluroethylene (PTFE), perfluoroethylenepropylene (FEP), perfluoroalkoxyalkane (PFA), ethylene tetrafluoroethylene (ETFE), poly(vinyldiene fluoride) (PVDF), and chlorinated ethylene tetrafluoroethylene.
  • PTFE polytetrafluroethylene
  • FEP perfluoroethylenepropylene
  • PFA perfluoroalkoxyalkane
  • ETFE ethylene tetrafluoroethylene
  • PVDF poly(vinyldiene fluoride)
  • Chinated ethylene tetrafluoroethylene tetrafluoroethylene
  • Blends may be used of fluorinated polymers with non-fluorinated polymers such as polyamides, polyimides, polyethersulfones, polyphenylene sulfides, and amine
  • Specific blends include PTFE/FEP/polyamideimide, PTFE/polyether sulphone (PES) and FEP-benzoguanamine.
  • Preferred interior coating materials are epoxy-phenolic resins, epoxy-urea-formaldehyde resins, PTFE, and FEP. Additional information regarding interior can coatings is taught in, e.g., EP 642992, WO 96/32099, WO 96/32150, WO 96/32151, and WO 96/32345, which disclose interior can coatings for drug suspension formulation products.
  • a preferred coating for the metal valve components is a very thin layer of fused silica glass, or other material, deposited by gas vapor deposition. Such coating is preferably used on all of the metal valve components in contact with the formulation, including the inside and outside of the metering chamber, inside and outside of the bottle emptier (if any), and the inside and outside of the valve stem (if metal).
  • the preferred such coating technique is the SilcosteelTM process available from Restek Corporation, Bellefonte, PA. This process deposits a submicron layer of fused silica glass on the metal components and can be used both on the valve components and on the interior of the canister.
  • the SilcosteelTM aspect of the invention is thus useful even outside the context of the chemical degradation problem, for both solution and suspension formulations.
  • the Silcosteel process is performed at a temperature of 400°C, which has the added benefit of thermally removing residual oils on the metal surface.
  • containers made from non-metal materials such as glass or plastic (e.g., polyethylene terephthalate, from Precise Plastic Ltd., U.K.).
  • glass containers it is preferred to use glass having a low metal oxide content.
  • ASTM American Society for Testing and Materials
  • Type I/Class A glass contains 2% aluminum oxide
  • Type 11/Class B glass contains 7% aluminum oxide. The former is therefore preferred.
  • Type III (soda-lime) glass vials may also be used (available from Wheaton Coated Products).
  • High metal oxide content glass should also be avoided during development and testing of formulations containing C-17 and/or C-21 OH 20-ketosteroids because such use could cause unsuspected chemical degradation due to the glass metal oxide content.
  • Coated containers can be made by pre-coating the metal roll stock before forming the container or by coating the container after it is made, by various techniques known in the art of coating.
  • suitable coating procedures include plasma coating, electrostatic dry powder coating, impregnating/spraying, hard anodization with polymer deposition, chemical vapor deposition (CVD), physical vapor deposition (PVD), as well as other procedures known in the art for this purpose.
  • the containers are coated with an epoxy resin and then baked.
  • Suitable coated containers can be obtained from, for example, Cebal Printal U.K. Ltd.
  • Preferred products/devices according to the present invention are pressurized aerosols such as MDIs that use liquefied gas propellants, including chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs), fluorocarbons (FCs), hydrocarbons (HCs), hydrochlorofluorocarbons (HCFCs), and dimethyl ether (DME).
  • CFCs chlorofluorocarbons
  • HFCs hydrofluorocarbons
  • FCs fluorocarbons
  • HCs hydrocarbons
  • HCFCs hydrochlorofluorocarbons
  • DME dimethyl ether
  • Propellants containing hydrogen are preferred.
  • Ethanol may also be included to assist in solubilizing the 20-ketosteroid, preferably in an amount of about 1-25%.
  • Formulations comprising dissolved C-17/21 OH 20-ketosteroid, HFC propellant, such as 134a and/or 227, with 5-20% ethanol are particularly preferred
  • the formulations are essentially non-aqueous, meaning that they do not include added water, although very small amounts of water may be present due to water ingress and/or as a residual in formulation components (such as ethanol).
  • Formulations will preferably have less than about 3%, and more preferably less than about 0.5 % water content.
  • the containers can be equipped with any suitable conventional or unconventional dispensing valve, preferably a metered dose valve.
  • Example 1 illustrates the effect of aluminum oxide in the degradation of another C-17/21 OH 20-ketosteroid, in this case triamcinolone acetonide, which has an OH attached to the C-21 carbon position.
  • Example illustrates the effect of aluminum oxide in the degradation of C-17/21 OH 20-ketosteroid, in the case dexamethasone, which has one OH attached to C-21 and another OH attached to C-17.
  • dexamethasone At ambient temperature, a 3 mL ethanol solution of dexamethasone (0.007 M) was mixed with 0.1 g of aluminum oxide (Aldrich, neutral, activated Brockmann I, 150 mesh), which mimics aluminum oxide existing on the inner surface of aluminum containers. The mixture was held at 75°C for several hours, and an aliquot was taken at each of the time intervals given in Table 3. Each aliquote was filtered with a syringe filter and diluted with acetonitrile by 20 times for HPLC analysis to determine the recoveries of dexamethasone with respect to the inital concentration. The recoveries of dexamethasone were compared with a reference, which contained the same concentration of dexamethasone but in ethanol solution without aluminum oxide.
  • aluminum oxide Aldrich, neutral, activated Brockmann I, 150 mesh
  • Example 5 and 6 were manufactured on a pilot-scale cold filler and filled into metered dose inhaler vials having various different components: different valve types, coated versus uncoated aluminum cans, and with and without a nylon desiccant insert. The units were then inverted and stored at either 40°C/85% RH for 14 days or 30°C/30% RH for 17 days prior to analysis of budesonide degradation.
  • valve used also had an impact on chemical stability.
  • the greatest chemical stability enhancement was found in units using a Bespak 357 valve with EPDM seals, a Cebal epoxy lacquered can, and the formulation of Example 6. Nearly as stable were units equipped with a 3M Neotechnic SpraymiserTM HFA valve, a Cebal epoxy lacquered can, and the formulations of Examples 5 or 6. Also, none of the valves tested were coated and it is expected that this would further enhance chemical stability.
  • Formulations using propellant 227 appeared to be slightly more stable. Containers having a desiccant generally exhibited reduced degradation compared to those without desiccant inserts. This suggests that water may increase degradation and that using dried ethanol may thus help further enhance chemical stability. Also, the use of certain antioxidants such as ascorbic acid and ascorbyl palmitate (but not vitamin E) appeared to enhance chemical stability, while the use of oleic acid appeared to reduce chemical stability.
  • Graph A shows comparative tests results on a budesonide solution formulation comprising 0.22% w/w budesonide, 11 % w/w ethanol, and the remainder 134a.
  • Three lots were stored at 40°C/75% RH.
  • One lot (identified as "Coated A") was contained in aluminum cans coated with an epoxy-phenolic coating (Cebal Printal Ltd. U.K.) and capped with a blind ferrule and a continuous gasket (made of DFDB 1085 elastomer, Union Carbide) so as to completely isolate the formulation from contact with metal surfaces.
  • Coated B Another lot (“Coated B”) was contained in the same type of cans as Coated A, but equipped with a functional valve ferrule (3M Neotechnic SpraymiserTM solution valve) having a solution gasket to partially prevent contact of the formulation with the underside of the valve ferrule.
  • a third lot (“Uncoated”) was contained in uncoated aluminum cans equipped with the same valves as for Coated B.
  • Example 8 the formulation contained 0.22% w/w budesonide dissolved in a mixture of 134a and 13% w/w ethanol.
  • the Example 9 formulation had 0.17% w/w budesonide dissolved in 134a and 15% w/w ethanol. In both cases, shown in Graphs B and C, respectively, the degradation rate was much greater in the Uncoated can, and degradation was least for Coated A.
  • Table 6 Container Closure System Initial Testing* 1 month @40°C/75%RH Total Impurities %w/w Total Impurities %w/w UV/Epoxy lot A 1.09 0.98 CV/FEP lot B 1.17 1.36 UV/FEP lot C 1.36 2.31 CV/Epoxy lot D 1.17 0.95 Table 7.
  • the data indicates the epoxy can is superior to the FEP in preventing degradation. Without wishing to be held to any particular mechanism to explain the difference in results between the two coating types, it is hypothisized that it is not that the phenolic epoxy provides a better barrier, but rather that some adsorption of degradation products is taking place. Essentially, the phenolic epoxy may be "soaking up" the degradates. A small amount of budesonide may also be adsorbed too, but the amount is apparently too small to affect the target content amount.

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EP00941435A 1999-06-18 2000-06-15 Steroid solution aerosol products with enhanced chemical stability Expired - Lifetime EP1194121B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06005429A EP1693053B1 (en) 1999-06-18 2000-06-15 Steroid solution aerosol products with enhanced chemical stability

Applications Claiming Priority (3)

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US13996199P 1999-06-18 1999-06-18
US139961P 1999-06-18
PCT/US2000/016462 WO2000078286A1 (en) 1999-06-18 2000-06-15 Steroid solution aerosol products with enhanced chemical stability

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EP06005429A Division EP1693053B1 (en) 1999-06-18 2000-06-15 Steroid solution aerosol products with enhanced chemical stability

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EP1194121A1 EP1194121A1 (en) 2002-04-10
EP1194121B1 true EP1194121B1 (en) 2006-03-22

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EP1693053A3 (en) 2007-06-27
CA2371931A1 (en) 2000-12-28
EP1693053A2 (en) 2006-08-23
AU5614200A (en) 2001-01-09
US20050220717A1 (en) 2005-10-06
ATE523190T1 (de) 2011-09-15
US20040033201A1 (en) 2004-02-19
DE60026840D1 (de) 2006-05-11
EP1693053B1 (en) 2011-09-07
US20020071810A1 (en) 2002-06-13
US6315985B1 (en) 2001-11-13
JP4777560B2 (ja) 2011-09-21
WO2000078286A1 (en) 2000-12-28
ATE320794T1 (de) 2006-04-15
JP2003502357A (ja) 2003-01-21
DE60026840T2 (de) 2006-10-12
US6610273B2 (en) 2003-08-26
AU777505B2 (en) 2004-10-21
EP1194121A1 (en) 2002-04-10

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